<template>
	<view>
		<view class="serch-box">
			<uni-search-bar :radius="100" @input="input" cancelButton="none" placeholder="请输入搜索内容"></uni-search-bar>
		</view>
		<view v-if="searchResults.length" class="sugg-list">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods_name">|{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<view v-else class="history-box">
		  <!-- 标题区域 -->
		  <view class="history-title">
		    <text>搜索历史</text>
		    <uni-icons type="trash" size="17" @click="clean"></uni-icons>
		  </view>
		  <!-- 列表区域 -->
		  <view class="history-list">
		    <uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
		  </view>
		</view>
	</view>
	
	
</template>

<script>
import { computed } from "vue";
	export default {
		data() {
			return {
				timer:null,
				kw:"",
				searchResults:[],
				historyList:[]
			};
		},
		onLoad() {
		  this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			input(e){
				//防抖
				clearTimeout(this.timer)
				this.timer=setTimeout(()=>{
					this.kw=e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				if(!this.kw.length){
					this.searchResults=[]
					return
				}
				const { data: res }=await uni.$http.get('https://api-hmugo-web.itheima.net/api/public/v1/goods/qsearch',{query:this.kw})
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				this.saveSearchHistory()
			},
			gotoDetail(item) {
			  uni.navigateTo({
			    // 指定详情页面的 URL 地址，并传递 goods_id 参数
			    url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
			  })
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				
				  // 1. 将 Array 数组转化为 Set 对象
				  const set = new Set(this.historyList)
				  // 2. 调用 Set 对象的 delete 方法，移除对应的元素
				  set.delete(this.kw)
				  // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
				  set.add(this.kw)
				  // 4. 将 Set 对象转化为 Array 数组
				  this.historyList = [...set]
				  uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
		},
		computed:{
			 historys() {
			    // 注意：由于数组是引用类型，所以不要直接基于原数组调用 reverse 方法，以免修改原数组中元素的顺序
			    // 而是应该新建一个内存无关的数组，再进行 reverse 反转
			    return [...this.historyList].reverse()
			  }
		}
	}
</script>

<style lang="scss">
	.serch-box{
		position: sticky;
		top: 0;
		z-index: 999;
	}
	.sugg-list {
	  padding: 0 5px;
	
	  .sugg-item {
	    font-size: 12px;
	    padding: 13px 0;
	    border-bottom: 1px solid #efefef;
	    display: flex;
	    align-items: center;
	    justify-content: space-between;
	
	    .goods-name {
	      // 文字不允许换行（单行文本）
	      white-space: nowrap;
	      // 溢出部分隐藏
	      overflow: hidden;
	      // 文本溢出后，使用 ... 代替
	      text-overflow: ellipsis;
	      margin-right: 3px;
	    }
	  }
	}
	.history-box {
	  padding: 0 5px;
	
	  .history-title {
	    display: flex;
	    justify-content: space-between;
	    align-items: center;
	    height: 40px;
	    font-size: 13px;
	    border-bottom: 1px solid #efefef;
	  }
	
	  .history-list {
	    display: flex;
	    flex-wrap: wrap;
	
	    .uni-tag {
	      margin-top: 5px;
	      margin-right: 5px;
	    }
	  }
	}
</style>
